And the 42-year-old was driven to tears after his fantastic contribution.
Ahead of his first game in charge of Helsingborgs, the Swede didn't have enough fit players. Particularly worrying was his lack of a goalkeeper.
But the former Celtic striker came up with the most creative of solutions.
Indeed, Larsson showed he's still got the magic touch - only this time instead of netting the goals for Celtic or Barcelona, the ex-forward was solving a problem in between the sticks... by playing his 42-year-old former kitman as a goalkeeper!
Yes, Daniel Andersson was recently Helsingborgs' kitman, before becoming their goalkeeping coach. Against Kalmar, however, Larsson picked Andersson as his actual goalkeeper.
And what's more - the veteran kept a clean sheet during a 0-0 draw!
Andersson was delighted with the outcome and his manager told TV station C More, as reported by Swedish newspaper Expressen: "You have to be impressed. He is almost 43 and didn't make a mistake in this game. I'm very happy to have Daniel Andersson multi-tasking for our club."
The paper also states that the 42-year-old goalkeeper was driven to tears after the game.
It looks like bravery and great decision making are still as much a part of Larsson's career as they were at Celtic, then. What a tremendous story in the modern game.